2012 Chevrolet Police Technical Manual (pdf) - GM Fleet

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can the installation of push bumpers on the front end of the vehicle affect the deployment of the air bag? General Motors is not aware of adverse effects during crash events from the many push bumpers that have been installed on GM police vehicles. Because there are many styles of push bumpers available with varying crash characteristics, installation of push bumpers may or may not affect deployment timing of the air bags. Push bumpers should be mounted to avoid modifying the vehicle structure and interfering with the front air bag sensors mounted on the upper radiator support cross member. Two front impact sensors are installed in General Motors vehicles. Do not relocate or disconnect the front sensors. The location and orientation of the front sensors are critical for correct operation of the air bag system. Avoid mounting components on or near the sensors. Push bumper styles with vertical pushing members that are in foreaft alignment with the front air bag sensors are not recommended. How long will the air bag remain inflated? It takes approximately 1/20th of a second to fully inflate the frontal air bags. This is faster than the blink of an eye. The air bags begin to deflate immediately, helping to stop the occupants more gradually. can the air bag system be re-used? No. The air bags are designed to inflate only once. After inflation some new parts will be required. These will include the air bag module and possibly other parts. (A competent service technician with access to the vehicle’s service manual and the required tools should replace the required components after a deployment crash.) I’ve heard that the dusts that are released into the passenger compartment from the air bag are harmful. Is this true? For most people, the only effect the dusts will produce is some irritation of the throat and eyes, and that is only if the occupant remains in the vehicle for many minutes after the air bag deployment with no ventilation and windows closed. However, some people with asthma may develop an asthmatic attack from inhaling the dusts. If this happens, they should first treat themselves the same way their doctor has advised them to treat any other asthma attack, and then immediately seek medical treatment. when should an air bag inflate? The driver’s and right-front passenger’s frontal air bags are designed to inflate in moderate to severe frontal or near-frontal crashes. But they are designed to inflate only if the impact speed is above the system’s designed "threshold level." In addition, if your vehicle has "dual stage" frontal air bags, these air bags tailor the amount of restraint according to crash severity. For moderate frontal impacts, the air bags inflate at a level less than full deployment. For more severe frontal impacts, "dual stage" frontal air bags deploy at full levels. If the front of your vehicle goes straight into a wall that doesn’t move or deform, the threshold level of the reduced deployment is about 12 to 16 mph (19 to 15 km/h), and the threshold level for a full deployment is about 18 to 24 mph (29 to 28.5 km/h). The threshold level can vary, however, with specific vehicle design, so that it can be somewhat above or below this range. If your vehicle strikes something that will move or deform such as a parked car, the threshold level will be higher. The driver’s and right-front passenger’s frontal air bags are not designed to inflate in rollover, side impacts, or rear impacts, because inflation would not help the occupant. aIr bags | 9 Seat mounted side impact air bags are designed to inflate in moderate to severe side crashes. The side impact air bags will inflate if the crash severity is above the designed "threshold level." The threshold level can vary with specific vehicles design. The side impact air bags are not designed to inflate on frontal or near-frontal impacts or rear impacts, because inflation would not help the occupant. Roof rail mounted head-curtain air bags are designed to inflate in moderate to severe side crashes. In addition, certain vehicles have head-curtain air bags which are also designed to inflate in situations where an impending rollover condition is identified by the vehicle’s rollover sensing system and/or frontal or near-frontal impacts if the crash severity is above the designed “threshold level”. Safety belt pretensioners at the driver and front passenger seat positions are designed to deploy in frontal, near-frontal, side, and rear crashes that exceed the “threshold level” of crash severity to help reduce slack in the safety belt. Safety belt pretensioners will also deploy in impending rollover situations. I’ve heard that a deployed air bag produces what appears to be smoke. Is the air bag hot? After the bag has deployed in a crash, the air bag itself will not be hot to touch. Some components within the air bag module will be hot for a short time. A small amount of smoke coming from a deployed air bag module is normal and should not be cause for concern. Also, when the nitrogen gas is vented out of the air bag, small particles from inside the bag are also vented into passenger compartment. These airborne particles look like smoke and some particles are deposited as residue on and around the air bag. If my vehicle has air bags, why should I have to wear my safety belt? Air bags are in many vehicles today and will be in most of them in the future. But they are supplemental systems only; so they work with safety belts - not instead of them. Every air bag system ever offered for sale has required the use of safety belts. Even if you’re in a vehicle that has air bags, you still have to buckle up to get the most protection. That’s true not only in frontal collisions but especially in side and other collisions. Head curtain side air bags are designed to help reduce the risk of head and neck injuries to front and rear seat occupants on the near side of certain side-impact collisions. Always use safety belts and the correct child restraints for your child’s age and size, even in vehicles equipped with air bags. Children are safer when properly secured in a rear seat. See your vehicle Owner’s Manual and child safety seat instructions for more information. 2012 Chevrolet Municipal Vehicles Technical Manual
10 | aIr bags Head curtain side air bags are designed to help reduce the risk of head and neck injuries to front and rear seat occupants on the near side of certain side-impact collisions. Always use safety belts and the correct child restraints for your child’s age and size, even in vehicles equipped with air bags. Children are safer when properly secured in a rear seat. See your vehicle Owner’s Manual and child safety seat instructions for more information. 2012 Chevrolet Municipal Vehicles Technical Manual toP viEW oF inStRuMEnt PanEL anD aPPRoXiMatE DEPLoyMEnt aREa oF thE aiR baG zonE A. Passenger side instrument panel top surface zone B. Passenger side air bag module trim panel – rear edge C. Passenger side door D. Approximate dimensions of inflated air bag E. Passenger side air bag deployment zone F. Passenger centerline G. Inside rearview mirror H. Vehicle centerline I. Driver centerline J. Driver side air bag deployment zone K. Front of steering wheel L. Driver side door M. Shift selector arc
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